Improvement in devices for heating and feeding air to furnaces



G. W. BROC.

'Patented sept'. 5, 187s.

DEVICES Fon HEATING-AND FEEDING .AIR To FURNACES.

' UNITED .STATES PATENT OFFICEo G. WILHELM BROC, OF HAMBURG, BAVARIA.

IMPIiOVEMENT IN DEVICES FOR HEATING AND FEEDING AIR T0 FURNACES.

Specification forming part of Letters Patent No. 181,767, dated September 5, 1876; application filed March 14, 1876.

To all 'whom it may concern:

Be it known that I, G. WILHELM BRoc, of Hamburg, Palatinate Bavaria, Empire of Germany, have invented a new and Improved Steam-Boiler, of which the following is a speci tication Figure 1 is a vertical transverse section of the improved steam-boiler, taken'on the plane of the line c c, Fig. 4. Fig. 2 is a vertical transverse section of the same, taken on the plane of the line c k, Fig. 4. Fig, 3 is a vertical longitudinal section of the'same'gtaken on the plane of the line la k, Fig. 4. Fig. 4 is a horizontal section of the same, taken on the plane of the line g q, Fig. 3. Fig. 5 is a detail front view, partly in section, ot' the automatic draft-regulating appliance of myfimproved steam-boiler.

Similar letters of reference indicate corresponding parts in all the figures.

This invention relates to a new construction of steam-boiler, and has for its object to avoid the use of long horizontal tubes; to augment the heating-surface, avoid loss of heat, and eiect an almost total consumption of combustible fuel; to reduce the height of the chimney, and regulate, automatically, the admission of air to the tire-chamber.

My invention consists in the novel combination of parts relating to the boiler and draftregulator, hereinafter more fully described.

In the accompanying drawing, the letter A represents the boiler proper, made of boileriron, of cylindrical or nearly cylindrical form, of suitable length and diameter. This boiler is made in three rigidly-united sections, a, b, and d. The end sections a and d are alike, or nearly so, in size and form but the middle section, which unites theends, comprises but about the upper halt' of the cylinder in crosssection, as indicated in Figs. l and 3, to form the upper part of the lire-chamber e. The end pieces a and d are, of course, closed against the fire chamber e, but are provided with tubes ff, which extend from their inner to their outer heads, as clearly shown in Fig. 3. That portion of the boiler which is above the plane ot' the bottom of the middle section b is not provided with dues, but constitutes one continuous water or steam chamber.

It will be perceived that, by thus constructthis manner the heatingsurface ofthe boiler is much better utilized than it can be' in boilers which have continuous tubing, and the,j heating-surface is, moreover, actually 1ncreased by the formation of the central recess e within the boiler.

The boiler A is supported on two transverse fire-walls, B B, directly below the inner ends of its end pieces a and d, the masonry O extending otherwise around the sides and ends of, and beneath, the boiler, but so as to leave the smoke-passages g and h, which are shown. The grate D isapplied in the masonry, beneath the chamber e, and below it is the ashpit t'. The passages k h lead by horizontal channels 'j j, which are indicated in Figs. 1 and 2, and by dotted lines in Fig. 4, into the chimney E. This chimney is comparatively short, and may have a suitable regulatingdamper, F, at or near its upper end.

The air which is to be fed to the flame enters the lower part of the brick foundation through a passage, l, whence it ascends into and descends again in U-shaped tubes G G, that are placed into the chimney E. In these tubes G the air is heated by the escaping products of combustion, and from said tubes it escapes into transverse horizontal passages m m, (clearly shown in Fig. 4,) which extend through the masonry at both sides of` the fire-chamber, and at a level above thegrate. Branchesnn extend from these passages m m into the lirechainber over the grate. Other branches o o extend from the passages m m into the ash pit below the grate, as shown in Fig. 3. There are as many branches o as there are branches n, the end ot' every branch o being contiguous to the inner end of a branch, n, at its junction with the passage m. A damper or valve, p, is placed into the passage m, to close the mouth of the branch n whenever said valve is in a vertical position, as in Fig. 4; but when the valve is let down into a horizontal position, it opens the channel n, but closes over the channel o contiguous thereto. Thera is, of course, a valve, p, for every pair of channels 11, o. The various valves p p in each passage 1n are connected with a rod, 1, by Which they are simultaneously raised or lowered. Two rods, 1', are used, one in each passage 1n. The front ends of the two rods 1` are provided with cranks, which connect by a system ot' rods and bell-cranks, s s, (shown in Fig. 5,) or by equivalent devices, with avertical slide, H. This slide is raised by a spring, t, and when thus raised serves to hold the several valves p 1o over the channels 0 o, closing the same. The slide H carries a funnelshaped detachable vessel, I, over which a similar vessel, J, lled with sand or equivalent substance, is suspended. The vessels I and J are of equal construction, and should each have a Valve to close its lower opening.

Upon starting the tire in the boiler it is desirable to feed the air over the grate, and the valves lo p are therefore closed over the channels o, leaving the channels 11, open. The valve in the upper vessel J is then opened, and the contents ot' this vessel flow into the vessel I, gradually weighting the same and counteracting the spring t, and the Valves p 19 are thereby gradually raised until, when the vessel I is filled, the channels 1L are closed and the channels o opened. By adjusting the valve in the chamber J, the time occupied for raising the valves p p can be regulated at pleasure.

When fresh fuel is to be added, or a new fire is to be started, the empty vessel .Tis placed upon theslide H, and the full vessel I suspended above it, so that the operation can be repeated, as above stated.

For the first direct draft a flue, u, extends from the lire-chamber directly into the chimney, as shown in Fig. 1. This flue is afterward closed by a damper, L.A

I claim as my inventionl. The combination of the. boiler A, Which has the two cylindrical ends a dand the intermediate tire-chamber, with the smoke-passages g g h h, transverse channels jj, and chimney, substantially as herein shown and described.

2. The combination, in a steam-boiler, of the air-passage l with the air-heating tubes G, chimney E, air-distributing passages mm, and channels n o, substantially as specified.

3. The combination of the valve p with the channels 11 o and passage 1n, to operate substantially as specified.

4. The airsupply-regulating apparatus, consisting of the vessels I J and slide H, combined with the valve p and channels 1n, 11 and o of a steam-boiler, to operate substantially as herein-shown and described.

The foregoing description of my invention signed by me this 12th day of February, 1876.

Gr. W. BROC. Witnesses:

C. LIEBER, F. BREGHBIEHL. 

